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Undoubtably the best post I've ever read on lapping a mold. Crystal clear instructions and photos. Remarkable. And please do a post on lapping that pistol barrel!!!! I have an old 3 screw Ruger .357 that has the same problem and really need to see that write-up. Thank you Sir! Audie...the Oldfart..

Thank you Eutectic.
And to answer your question, I didn't want to alter the front band, as it is a bore rider. However, you make a very good and valid point, and what i should have made clear is that if you want a full diameter front band, then just don't remove it from the slug lap. Different schools of thought on the type of boolits I guess. As it is, the front band on these boolits measures around .354 or thereabouts. So, it was designed not to be 'full' size. I didnt want to complicate matters, so for now I thought to leave it be.

I am curious about this, as I have the exact same mold and WOULD want to take all the bands up to .359"-.360", and have the same issue of the front one being smaller than the back two. I'm guessing that you'd start by doing all three bands at once, until the larger back two reach the desired spec, then cast some new slugs and only do the smaller front band? I'd think you'd need to leave at least the rearmost band on the lap to ensure everything stays straight?

Well the directions work just great! I fixed my Lyman mold H&G clone for 45ACP 200 gr SWC. Was 0.4505 and now is 0.4525. Perfect for my old faith ful. I can size it down one more thousand if my Gold Cup likes that better.

Thanks for this!!! I'll be in the shop enlarging my RCBS 416-350 tomorrow. It drops just a bit too small and a 416 sizing die barely touches the parting line even when cast with pure Lino. I bet I need to cut the GC shank down to keep from enlarging this area.

ETA: Followed the instructions and it works well. I now have a fatter bullet that actually gets sized by the sizer instead of just barely getting touched. Took less time than I thought it would and the bullets drop out nice and round and literally fall out of the mold. THANKS!!!